They__do well in the exam A,can be able to B. be able to C.can able to D.are able to
题目
They__do well in the exam A,can be able to B. be able to C.can able to D.are able to
答案
D
can和be able to都表示“能”
两者不会同时使用
要么用can,要么用be(需要根据语态和时态修改) able to
这里用are able to
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已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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